Abstract: A motor rotor includes a rotor core and a plurality of reluctance parts. The rotor core includes a plurality of metal parts and an inner hole for the motor rotor, the inner hole of the motor rotor passes through the rotor core, and the areas of the metal parts form a rotor metal total area ?Ametal. The plurality of reluctance parts are disposed surrounding the inner hole of the motor rotor, each of the reluctance parts comprising a plurality of flux barriers penetrating through the rotor core. The areas of the flux barriers in all the reluctance parts form a flux barrier total area ?Aair. The sum of ?Aair and ?Ametal is a rotor effective total area, and the ratio of ?Aair to the rotor effective total area is a flux barrier ratio KA, which is expressed as K A = ? A air ? A air + ? A metal , and satisfies 0.25?KA?0.5.

Abstract: A motor rotor is provided, comprising: a rotor core, comprising a plurality of metal parts and an inner hole of the rotor, the inner hole of the rotor passing through the rotor core, and the metal parts constituting a rotor metal total area ?Ametal; and a plurality of reluctance parts, disposed surrounding the inner hole of the rotor, each of the reluctance parts comprising at least one flux barrier, at least one of the flux barriers penetrating the rotor core, and the at least one of the flux barriers in each of the reluctance parts constituting a flux barrier total area ?Aair; wherein, the sum of ?Aair and ?Ametal being a rotor effective total area, and the ratio of ?Aair to the rotor effective total area being a flux barrier ratio KA, expressed as KA=?Aair/?Aair+?Ametal, and the flux barrier ratio KA satisfying the following relation: 0.25?KA?0.5.